Migrate to `cibuildwheel` and distribute wheels directly

[harshil21]

Using cibuildwheel to build the wheels for every platform and architecture should be possible. This eliminates the need to "download" the c++ binaries and we can even eliminate the build hook altogether.

Just need to figure out how pip actually selects the wheels for each platform. I believe its dependent on the tag of the wheel, but I would have to test that.

[harshil21]

I was being dumb. We don't even need cibuildwheel since we already have the binaries! Just need to tag them and make wheels.